Have you got the leaving time of the train for me?—Yes, but you’d better ____of it by yourself.

Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.

The old lady, _______ had been killed in the war, was given help by the local government．

It is important to keep ______ in an emergency (紧急情况).

Our classroome________very day．